Allow staff to save certain rooms as "favourites" associated with their login.
This would mean that all searches show results for just the rooms they have saved as Favourites unless they change the search parameters.

e.g. Branch staff would typically book programs at rooms within their location only, so they could save room at their branch as their favourites. Staff working with venue rentals would only be looking at 3 of the 27 bookable spaces most of the time, so they could list those 3 spaces as their favourites.